张紧器-隔水管耦合横向振动特性研究

Study on Lateral Vibration Characteristics of Tensioner-Riser Coupling

为准确了解张紧器-隔水管耦合横向振动特性,考虑张紧器与隔水管耦合以及张紧器参数等因素的影响,基于动力学基本原理建立了张紧器与隔水管耦合悬挂模式下的横向振动动力学仿真模型,利用有限差分法进行离散并在Matlab/Simulink进行耦合求解,分析张紧器参数、张紧器与隔水管的耦合、LMRP/BOP(防喷器组)质量对张紧器耦合隔水管悬挂模式下横向振动的影响。仿真结果表明:张紧器输出张紧力随张紧器气瓶压力的增加、张紧器活塞杆位移的增大而增大;考虑张紧器与隔水管耦合下隔水管横向振动位移减小,但增大隔水管受到的应力;隔水管横向振动位移与张紧器气瓶压力成反比,但隔水管受到的应力与张紧器气瓶压力成正比;隔水管底部LMRP/BOP质量与隔水管受到的应力成正比,与隔水管横向振动位移成反比。研究结果可为隔水管的现场悬挂操作提供理论支持。

To accurately understand the lateral vibration characteristics of the tensioner-riser coupling,considering the influence of the tensioner and the riser coupling and the tensioner parameters and other factors,the lateral vibration dynamics simulation model under the tensioner and the riser coupling suspension mode is established based on the basic principles of dynamics.The finite difference method is used for discretization and the coupling solution is performed in Matlab/Simulink to analyze the influences of tensioner parameters,the coupling between the tensioner and the riser,and the weight of LMRP/BOP(blowout preventer stacks)on the lateral vibration in the suspension mode of tensioner-riser coupling.The simulation results show that the output tension force of the tensioner increases with the pressure of the tensioner cylinder and the displacement of the tensioner piston rod.The coupling of the tensioner and the riser reduces the lateral vibration displacement of the riser,but increase the stress on the riser.The lateral vibration displacement of the riser is inversely proportional to the tensioner cylinder pressure,but the stress on the riser is proportional to the tensioner cylinder pressure.The LMRP/BOP weight at the bottom of the riser is proportional to the stress on the riser and is inversely proportional to the lateral vibration displacement of the riser.The research results can provide theoretical support for on-site suspension operations.